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A Study of Tarlatamab in Combination With AB248 in Participants With Extensive Stage Small Cell Lung Cancer (DeLLphi-311)

A Phase 1b Study Evaluating the Safety, Tolerability, Pharmacokinetics, and Efficacy of Tarlatamab in Combination With AB248 in Participants With Extensive Stage Small Cell Lung Cancer (DeLLphi-311)

Status
Recruiting
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07037758
Acronym
DeLLphi-311
Enrollment
380
Registered
2025-06-25
Start date
2025-09-16
Completion date
2031-01-18
Last updated
2026-05-29

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Extensive Stage Small Cell Lung Cancer

Keywords

ES-SCLC, Tarlatamab, AMG 757, AB248, Imdelltra

Brief summary

The primary objective for dose exploration and dose expansion is to evaluate the safety and tolerability of tarlatamab in combination with AB248. The primary objective for dose exploration only is to determine the recommended dose for expansion and/or maximum tolerated combination dose (MTCD) of AB248 in combination with tarlatamab.

Interventions

DRUGTarlatamab

Administered as an IV infusion.

DRUGAB248

Administered either as an IV infusion followed by a flush or using a syringe pump without a flush.

Sponsors

Amgen
Lead SponsorINDUSTRY
Asher Biotherapeutics, Inc.
CollaboratorINDUSTRY

Study design

Allocation
NON_RANDOMIZED
Intervention model
SEQUENTIAL
Primary purpose
TREATMENT
Masking
NONE

Eligibility

Sex/Gender
ALL
Age
18 Years to 90 Years
Healthy volunteers
No

Inclusion criteria

1. Participant has provided informed consent before initiation of any study-specific activities/procedures. 2. Participants ≥ 18 years (or ≥ legal age within the country if it is older than 18 years) at the time of signing the informed consent. 3. Participants with histologically or cytologically confirmed ES-SCLC that has progressed or recurred following at least 1 line of anti-cancer therapy for ES-SCLC. 4. Participants must have at least 1 measurable lesion as defined by RECIST 1.1 within 21-day screening period, not previously irradiated. 5. Participants must have adequate organ function (hematological, coagulation, cardiac, pulmonary, kidney, and liver). 6. Participants must submit a fresh tumor biopsy at screening unless a new biopsy cannot be performed safely or is infeasible. Participants who cannot provide fresh tissue may provide archival tissue that was collected after last anticancer therapy.

Exclusion criteria

1. Symptomatic central nervous system (CNS) metastases. 2. Participants with brain metastases may be eligible if criteria defined in the protocol are met. 3. Prior therapy with any delta-like ligand 3 (DLL3)-directed therapy (including tarlatamab). 4. Prior interleukin (IL)-2, IL-7 or IL-15 targeted therapy. 5. Baseline (at rest) requirement of supplemental oxygen.

Design outcomes

Primary

MeasureTime frameDescription
Number of Participants with Treatment-emergent Adverse Events (TEAEs)Up to 2.5 yearsClinically significant changes in vital signs and clinical laboratory tests will be reported as adverse events.
Dose Exploration: Number of Participants with Dose-limiting Toxicities (DLTs)Up to 35 days

Secondary

MeasureTime frame
Maximum Serum Concentration (Cmax) of TarlatamabUp to approximately 21 weeks
Minimum Serum Concentration (Cmin) of TarlatamabUp to approximately 21 weeks
Area Under the Concentration-time Curve (AUC) of TarlatamabUp to approximately 21 weeks
Half-life (t1/2) of TarlatamabUp to approximately 21 weeks
Objective Response (OR) per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1Up to 2.5 years
Duration of Response (DOR) per RECIST 1.1Up to 2.5 years
Time to Response (TTR) per RECIST 1.1Up to 2.5 years
Disease Control (DC) per RECIST 1.1Up to 2.5 years
Progression-free Survival (PFS) per RECIST 1.1Up to 2.5 years
Time to Progression (TTP) per RECIST 1.1Up to 2.5 years
Time to Subsequent TherapyUp to 2.5 years
Overall Survival (OS)Up to 2.5 years
Number of Participants with Anti-AB248 Antibody FormationUp to 2.5 years

Countries

South Korea, Turkey (Türkiye), United States

Contacts

CONTACTAmgen Call Center
medinfo@amgen.com866-572-6436
STUDY_DIRECTORMD

Amgen

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: May 30, 2026